Uninsulated duct runs are the weak point of many fresh air and heat recovery installations. In winter, supply air loses heat before it reaches the room; in summer, cold duct surfaces sweat and drip. Both mean wasted energy — and condensation that can damage ceilings and walls.
Our answer is the Insulated HDPRE Semi-Rigid Duct — a pre-insulated, semi-rigid corrugated duct for fresh air and heat recovery systems. With an integrated 15 mm insulation layer, it keeps the air temperature on the way to the room and stops condensation at the source, so no on-site wrapping is ever needed.
The duct combines the best of flexible and rigid ducting in one product. Its semi-rigid corrugated wall holds its shape through bends and long runs, while remaining flexible enough to route around obstacles by hand — no elbows, no complex fabrication.
Semi-rigid, shape-holding body — routes easily but resists crushing and kinking in tight ceiling and wall spaces;
15 mm integrated insulation layer — pre-fitted at the factory, keeps heat in (or out) along the whole run;
Smooth inner bore — low airflow resistance and reduced noise from turbulence;
Condensation-free surface — insulated outer wall stays above dew point in normal operation;
Fast installation — cut to length and connect with standard duct fittings; no separate insulation work;
Lightweight and clean — easy one-person handling on site, suitable for concealed installation.
| Parameter | Value | Notes |
|---|---|---|
| Product name | Insulated HDPRE semi-rigid duct | Also known as semi-rigid duct / half-flexible duct |
| Application | Fresh air (FAU), heat recovery (ERV / HRV) systems | Supply and exhaust branches |
| Inner diameters | Ø75 / 110 / 160 mm | Other sizes on request |
| Insulation layer | 15 mm | Integrated pre-insulation |
| Length per roll | 50 m (cut to any length) | Typical roll length |
| Operating temperature | -20 to +60 °C | Typical range |
| Duct body | Semi-rigid corrugated wall | Corrosion-resistant, no rust |
| Fittings | Standard duct connectors available | Matching size range |
Designed for any ducted ventilation run where insulation matters and space is tight:
Fresh air systems — supply branches from the air handling unit to bedrooms, living rooms and offices;
Heat recovery units (ERV / HRV) — insulated fresh-air and exhaust-air connections between the unit and room terminals;
Concealed installations — inside ceilings, under floors and behind walls, without condensation risk;
Retrofit projects — routed through existing cavities where rigid duct would be impractical;
Residential & light commercial — apartments, villas, hotels, offices and classrooms.
Good ventilation deserves good ductwork. With the Insulated HDPRE Semi-Rigid Duct, you save installation time, avoid condensation damage and deliver fresh air at the right temperature — from the unit all the way to the room.
We supply a full range of diameters and lengths together with compatible fittings, and support OEM / custom specifications. Contact our sales team for samples, datasheets and project pricing.
Related products: HDPRE duct fittings · Flexible aluminum duct · ERV / HRV accessories
The southeast corner of the private entrepreneurship park in Huadian Town, Qihui County, Dezhou City, Shandong Province